Cambodia has an interesting rail system that is entrepreneurial to say
the least.  The official rail service is old and decrepit and service
from Battambang (Cambodia’s second city) to Phnom Penh departs just once a week, so entrepreneurs have filled
the gap with homemade bamboo cars propelled by electric motors.  You can read about it here on BBC and here’s an excerpt:

They have created their own rail service using little
more than pieces of bamboo. The locals call the vehicles "noris", or
"lorries", but overseas visitors know them as "bamboo trains".

A tiny electric generator engine provides the power, and
the passenger accommodation is a bamboo platform that rests on top of
two sets of wheels. A dried-grass mat to sit on counts as a luxury.

It would be a white-knuckle ride – if there were actually anything to hold on to.

The bamboo trains reach about 40km/h (25mph), with the
track just a couple of inches below the passengers. Warped and broken
rails make for a bone-shaking journey…

Low fares add to the appeal, but the service is not
without its quirks. There is only one track – so if two trains meet,
the one with the lightest load has to be taken off the rails so the
other can pass.