Hey, if missed one chest at the Chaincrawler (the train), because I didn´t figured out, how to push a block back >_<

But now I figured it out through another chest in the mainmap, but can´t get back in the sidearea Chaincrawler.

Is this a missed chest/achievment (100% Chaincrawler) or can i reenter the area again?

Thanks in advance (^_^)_/