Bukkit

{{http://i.imgur.com/UV5D1Vc.png}} Every time the server restarts, the trains essentially explode, become immovable, and jam up the otherwise functional system. Essentially, our server's train network looks somewhat like this. {{http://i.imgur.com/h4XiBPZ.png}} However, when a train is in the station and the server restarts, it essentially explodes - one or more carts will detach from the train and the rest of the train will no longer be movable. There are no errors on startup. < 19:10:19 [INFO] [Train Carts] Enabling Train Carts v1.72.7 19:10:20 [INFO] [Train Carts] 23 Trains have been loaded in 1 world. (32 Minecarts) 19:10:21 [INFO] [Train Carts] 0 detector rail regions loaded covering 0 blocks 19:10:21 [INFO] [Train Carts] Restoring trains and loading nearby chunks... 19:10:21 [INFO] [Train Carts] SignLink detected, support for arrival signs added! 19:10:21 [INFO] Train Carts version 1.72.7 enabled! (2.309s) <

I know this is an old ticket, but...
Make sure your groupdata file is being saved correctly! After shutting down your server (with the /stop command) check to see if the last modified date of that file has changed, and make absolutely sure there are no IO errors in your server.log file.