The SR-MerchantNavy_4-6-2Tender is defined in two files: sr-mn-4-6-2.dat and sr-mn-4-6-2-tender.dat. Moreover the definitions differ in length, constraints and the used images (one is split in many 128x128 pictures, the other is one image per livery with all rotations)
Thank you for the report - I believe that I have now fixed this.