I think people at doaba region are rich and modern they spend more money so train like vande bharat would be successful in anritsar ,jalandhar ludhiana belt even it has shatabadi but on other part of ounjab like patiala ,barnala ,bathinda,firozpur they were more likely to save money so if we think about vb from delhi to bti via pta ,bnn it take 5hrs on average and on other hand bathinda superfast ,punjab mail has nerely same duration abd ticket would be cheaper compare to vande bharat sply in 3a that reason but it may got patronage from pariala