Explanation

This week we did explanations. I did mine on steam trains here is my writing 

first The engineer shovels the coal into the fire box the fire box heats up the boiler which is a big water tank.

 the steam  from the boiler goes through a pipe down to the pistons.

The pistons push the crankshaft and the crankshaft moves the wheel the chimney let the smoke from the fire box out.

Thanks for reading