In order for the nighttime lines to work properly and have passengers board the bus you must either:
A) change your destination manually to the day time destination
B) change the terminus in the hof to the day time destination
C) The proper fix:
go to maps\Gehrten Modded\TTData and open N1_GRO_HAL,ttp with notepad or notepad++ go to line 10 and replace
"Hallenberg" with "N1 Hallenberg", repeat the same process with N1_HAL_GRO replacing "Grossenfeld" with "N1 Grossenfeld"
same thing for the N2 ttp files, just add N2 before "Luthe" and "Gehrten ICE" in the N2_ICE_LUT.ttp and N2_LUT_ICE.ttp files respectively
Also make sure you are using the correct hof, old and new version hof's are named "gehrten modded"