Train coaches washing system?

Question

Train coaches washing system?

Answer 1

you can find this washing machine at the larger hub centers for amtrak

Answer 2

An automated system of high pressure water pipe located over a siding rail line that is shaped slightly larger than the engine and carriages and has a series of nozzles on it to spray a mixture of water and detergent on the engine and carriages as they pass through it.

After that are three very large rotary brushes, one on each side and one over the top that automatically come in contact, scrub carriages as they pass inside them as a well as distributing clean water to rinse the surfaces of the carriages.

The system is automated and the train is slowly driven through the cleaning system at a slow speed to adequately clean, scrub and wash off the carriages.