Semi-new issue. Guessing it is related to the other issues, but it needs a different fix. Occurs when placing a power pole via robot/ghost.

Error while running event RailPowerSystem::on_robot_built_entity (ID 14)
Entity is not rail-signal.
stack traceback:
RailPowerSystem/methods/railPoleConnectorFunctions.lua:15: in function 'new'
RailPowerSystem/methods/globalEvents.lua:29: in function 'OnBuilt'
HermiosLibs/controlLib.lua:51: in function <HermiosLibs/controlLib.lua:45>
stack traceback:
[C]: in function 'get_connected_rails'
RailPowerSystem/methods/railPoleConnectorFunctions.lua:15: in function 'new'
RailPowerSystem/methods/globalEvents.lua:29: in function 'OnBuilt'
HermiosLibs/controlLib.lua:51: in function <HermiosLibs/controlLib.lua:45>

Hope you are still working on this. I understand being busy and things taking time, but it has also been a really long time since it was updated and some of the issues have fixes, even if temporary, that could be incorporated in a couple minutes rather than leaving it to the users to install (some who may not know how to do the update and just want to play the game.)