I left the stairs I used to get down here off the schematic to make it easier to stick this onto whatever you prefer.

This is my underground Train Station. I used this as the Hub from my main base that use to lead to all of my other bases. You can totally build this above ground if you like for your needs but it was originally underground. I left the halls empty so you could easily pick the block and style of walkway you wanted. ( I color coordinated mine to make it easy to know which Train I was boarding.

This was cleaned up and I removed all the extra blocks around it to make it easier to build, Please leave a diamond if you like!