These are models of trackside relayboxes as seen in the Netherlands. 

The models are made according to the dimentions i found in a train magazine. For those intressed Railmagazine 115.

I print the relay box seperate from its base, because this is easier for painting and in some situations a base may not be necessary. If you want to print it in one piece i also inluded a file with the base attached.

The wide variant can best be printed on it side and the high variant can be best printed om its back to prevent stair stepping on the roof.