12715/16 is running via Ambala Cantt-Rajpura-Sirhind-Khanna-Ludhiana route.
After covid I think, it was re-routed via Ambala Cantt-Chandigarh-Ludhiana.
But with constant efforts of MP Lok Sabha Fatehgarh Sahb,the train re-routed to its old and original route via Rajpura,Sirhind,Khanna,Ludhiana.
The reason was that this connect Historical Gurudwara's in Fatehgarh Sahib to Hazur Sahib ji.