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rail [see pinned posts]Leaky feeder coaxial antennas are so silly but also brilliant for their applicationIt's not the best kind of antenna, but it's good enough and for certain applications it's more than greatDelivering not-the-greatest-but-consistent signal reception over long distances or in magnetically challenging places is perfect for e.g. tunnels or trainsThat's usually how antennas for onboard WiFi and GSM / LTE repeaters on trains workThe fact that the signal from a leaky feeder cable is not the best, combined with the fact that a train itself is a non-perfect Faraday cage is also a good thing in this scenario because a moving BTS for mobile data is a regulatory nightmare<a href="https://bark.lgbt/tags/RailInfodump" class="mention hashtag" rel="nofollow noopener" target="_blank">#RailInfodump</a>

rail [see pinned posts]You might be surprised to hear that the US actually DO have SOME high(ish)-speed rail. Single line really – the Northeast Corridor, connecting Boston with Washington DC through Philadelphia, NYC and Baltimore. Service is Acela, the high-speed offer of AmtrakWith that context out of the way, I'd like to bring your attention to the latest Acela rolling-stock, the Avelia Liberty made by Alstom, based on the Avelia Horizon platform – and how much of a disaster that wasWith manufacturing and assembly starting in 2017, trains were expected to enter service in 2022However, with massively delayed manufacturing and multiple failed certifications caused by the inadequate, often ancient American infrastructure, Liberty trainsets, being 3 years behind schedule, are still not in commercial service, waiting for their time to shine.There is no way they will start running passenger service in 2024. Maybe next year. Or maybe not. We'll see!<a href="https://bark.lgbt/tags/railinfodump" class="mention hashtag" rel="nofollow noopener" target="_blank">#railinfodump</a> <a href="https://bark.lgbt/tags/acela" class="mention hashtag" rel="nofollow noopener" target="_blank">#acela</a> <a href="https://bark.lgbt/tags/amtrak" class="mention hashtag" rel="nofollow noopener" target="_blank">#amtrak</a> <a href="https://bark.lgbt/tags/railway" class="mention hashtag" rel="nofollow noopener" target="_blank">#railway</a>

rail [see pinned posts]Many of you might already know that due to historical reasons, Japan uses two incompatible power systems with mismatched frequencies That has its consequence in railways tooMeet Tokyo Central station. As you can see, western and eastern Shinkansen lines terminate here. They're not connected with each other and use different electrification depending on which part of the country the line goes to – 25kV 50Hz or 60HzNormal-speed lines use 1.5kV DC electrification This small infodump was brought to you by <a href="https://ohai.social/@aroma" class="u-url mention" rel="nofollow noopener" target="_blank">@aroma</a> who brought my attention to that detail<a href="https://bark.lgbt/tags/railinfodump" class="mention hashtag" rel="nofollow noopener" target="_blank">#railinfodump</a>

rail [see pinned posts]Today I want to tell you about another interesting railway fact from Poland.Let me introduce you to railway line no. 65, also known as LHS, Linia Hutnicza Szerokotorowa (Broad-gauge Metallurgy Line). It's special for a few reasons.It's the longest 1520mm rail line in Poland spanning nearly 400km (all other ones are short sections near the border) and connecting with the Ukrainian rail network.It's the furthest west 1520mm line in Europe.It's run and used by a different legal entity than all other public railroads in Poland (PKP LHS, not PKP PLK).It's freight-only, even tho in the 90s passenger services to Ukraine and Russia existed. The line supports passenger infrastructure on a few stops it goes through. It was used for special evacuation trains from Ukraine in 2022.The line is a project of the 70s and remains an interesting railway trivia of Poland to this day<a href="https://bark.lgbt/tags/railway" class="mention hashtag" rel="nofollow noopener" target="_blank">#railway</a> <a href="https://bark.lgbt/tags/railroad" class="mention hashtag" rel="nofollow noopener" target="_blank">#railroad</a> <a href="https://bark.lgbt/tags/trains" class="mention hashtag" rel="nofollow noopener" target="_blank">#trains</a> <a href="https://bark.lgbt/tags/railinfodump" class="mention hashtag" rel="nofollow noopener" target="_blank">#railinfodump</a>

rail [see pinned posts]Another form of adding extra rails to the track (tho not for running trains of different gauges) is installing guard rails, also known as catching railsThose are most commonly used (and often mandatory) on bridges and in tunnels. Their purpose is making sure the train keeps running in the same direction and doesn't fall out of the track in case of a derailment <a href="https://bark.lgbt/tags/railway" class="mention hashtag" rel="nofollow noopener" target="_blank">#railway</a> <a href="https://bark.lgbt/tags/railroad" class="mention hashtag" rel="nofollow noopener" target="_blank">#railroad</a> <a href="https://bark.lgbt/tags/trains" class="mention hashtag" rel="nofollow noopener" target="_blank">#trains</a> <a href="https://bark.lgbt/tags/railinfodump" class="mention hashtag" rel="nofollow noopener" target="_blank">#railinfodump</a>

rail [see pinned posts]You've heard about bogie changing to make a train able to run on a different track gauge. And if you haven't: <a href="https://bark.lgbt/@rail_/113135310666591799" rel="nofollow noopener" translate="no" target="_blank">https://bark.lgbt/@rail_/113135310666591799</a>Now prepare for another silly railway technology to tickle at that problem: double-gauge tracks.Installing two sets of rails (or adding a simple 3rd rail) onto the same section of the track to make it able to support trains of two different gauges at the same timeSolutions like this are not uncommon in places with old historical narrow-gauge infrastructure connecting with modern standard-gauge tracks, countries using two gauges (Spain…) as well as in bordering regions of countries using two different gaugesIt's cheaper to construct compared to having two separate tracks using different gauges, and simpler and cheaper than gauge-changing technology (that is also being used e.g. in Spain)<a href="https://bark.lgbt/tags/train" class="mention hashtag" rel="nofollow noopener" target="_blank">#train</a> <a href="https://bark.lgbt/tags/trains" class="mention hashtag" rel="nofollow noopener" target="_blank">#trains</a> <a href="https://bark.lgbt/tags/railway" class="mention hashtag" rel="nofollow noopener" target="_blank">#railway</a> <a href="https://bark.lgbt/tags/railroad" class="mention hashtag" rel="nofollow noopener" target="_blank">#railroad</a> <a href="https://bark.lgbt/tags/railinfodump" class="mention hashtag" rel="nofollow noopener" target="_blank">#railinfodump</a>

rail [see pinned posts]Overall I must say that the small PC I picked to be my router is pretty great, so here have a few details about my setupFujitsu S920 ultra-small form factor PC, for me with 4GB of RAM and passively-cooled AMD GX-415GA CPU – consumes ~10W max during normal operation (checked with a shitty hardware store wattage meter)It can be bought dirt cheap on the 2nd hand market and – which is rare for this kind of hardware – comes with a low-profile x4 PCIe slotThat makes it perfect for installing a network card and turning it into a routerCPU is low-power but with proper software can manage routing 1Gbps both ways at the same time even with PPPoE encapsulationAdditionally with two rear RS232 serial ports (+ some extra on the motherboard) you can do funny things like receiving GPS time and self-hosting a STRATUM 1 NTP server at home :3<a href="https://bark.lgbt/tags/homelab" class="mention hashtag" rel="nofollow noopener" target="_blank">#homelab</a> <a href="https://bark.lgbt/tags/diy" class="mention hashtag" rel="nofollow noopener" target="_blank">#diy</a> <a href="https://bark.lgbt/tags/networking" class="mention hashtag" rel="nofollow noopener" target="_blank">#networking</a> <a href="https://bark.lgbt/tags/railinfodump" class="mention hashtag" rel="nofollow noopener" target="_blank">#railinfodump</a>

rail [see pinned posts]Not very widely known funfact: twice during the 90s TGV trains arrived in Poland.The first time it happened in 1991 when the record-braking TGV Atlantique unit 325 (the one that ran 515 km/h) was brought to Warsaw for a HSR conference. It couldn't run on its own because of incompatible power mode.Then in 1995, for the 150th anniversary of railways in Poland, courtesy of SNCF and Alstom PKP borrowed TGV Réseau 4522 (which was not in service yet). Because it was multi-mode and supported 3kV DC, it ran a bunch of special rides between 12 and 19 June 1995, stopping in multiple cities and attracting a lot of interest.The train was operated by the SNCF staff, with Polish crew present in the driver's cabin.<a href="https://bark.lgbt/tags/trains" class="mention hashtag" rel="nofollow noopener" target="_blank">#trains</a> <a href="https://bark.lgbt/tags/train" class="mention hashtag" rel="nofollow noopener" target="_blank">#train</a> <a href="https://bark.lgbt/tags/railway" class="mention hashtag" rel="nofollow noopener" target="_blank">#railway</a> <a href="https://bark.lgbt/tags/railways" class="mention hashtag" rel="nofollow noopener" target="_blank">#railways</a> <a href="https://bark.lgbt/tags/history" class="mention hashtag" rel="nofollow noopener" target="_blank">#history</a> <a href="https://bark.lgbt/tags/poland" class="mention hashtag" rel="nofollow noopener" target="_blank">#poland</a> <a href="https://bark.lgbt/tags/tgv" class="mention hashtag" rel="nofollow noopener" target="_blank">#tgv</a> <a href="https://bark.lgbt/tags/sncf" class="mention hashtag" rel="nofollow noopener" target="_blank">#sncf</a> <a href="https://bark.lgbt/tags/pkp" class="mention hashtag" rel="nofollow noopener" target="_blank">#pkp</a> <a href="https://bark.lgbt/tags/railinfodump" class="mention hashtag" rel="nofollow noopener" target="_blank">#railinfodump</a>

rail [see pinned posts]Usually, when traveling by train between countries that use different railway gauges, passengers need to change trainsHowever, sometimes on long-distance or sleeper connection, an alternative solution is used – bogie exchangeThe entire train is rolled into a maintenance depot, then railcars are decoupled and lifted off their bogies (the element that wheels are attached to) using a special craneBogies get rolled out, and a new set is rolled in to align with a car and lower it back down onto itThat procedure is used for freight cars e.g. on the China-Russia border, but also it's a standard procedure for passenger coaches, in such cases doors get locked for the time of the operation and passengers remain inside while the cars are worked onThis allows multiple long-distance connection from Ukraine to Europe to exist, before the war and COVID also allowed multiple Russian trains to enter European railsVideo showing how it's done: <a href="https://youtu.be/2nI467sc-Eo" rel="nofollow noopener" translate="no" target="_blank">https://youtu.be/2nI467sc-Eo</a><a href="https://bark.lgbt/tags/trains" class="mention hashtag" rel="nofollow noopener" target="_blank">#trains</a> <a href="https://bark.lgbt/tags/railinfodump" class="mention hashtag" rel="nofollow noopener" target="_blank">#railinfodump</a>

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