(not parent) personally I would like to see [trains](https://aplwiki.com/wiki/Tacit_programming#Trains https://aplwiki.com/wiki/Tacit_programming#Trains) in mor

(not parent) personally I would like to see [trains](https://aplwiki.com/wiki/Tacit_programming#Trains https://aplwiki.com/wiki/Tacit_programming#Trains) in more languages, though the way they are implemented in APL is pretty spotty (e.g. the length of a train changes its semantics)