Al bro king track Trainz 12

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I have built a hump yard. Incoming consist come in on an approach track, the engines disconnects and moves to the service area. Now I have a second power unit to cone in at the end of the consist and push it over the hump. My problem is when the second unit comes to the track the consist is on it stops and I get a message saying "track backed by Al Train" my question is , is there a way to unblock it or remove that restriction so the second engine can enter the track and connect.


I' m using Trainz 12 on Mac.
Thanks in advance for any help you can provide.

 

[sniper297]

PON_Dwarf_Signal_USA_L02_Permissive,<kuid:522774:100020>
PON_Dwarf_Signal_USA_02_Permissive,<kuid:522774:100021>

 

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Thanks so much!