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: https://youtu.be/2nI467sc-Eo#trains #train
