DRS 37510 looks like 37515...
http://37517smodernlocopics.fotoblog.co.uk/p20401143.html - DRS owned and in DRS livery at Barrow Hill there.
So not really modified with new lights etc...
37229, 37194, 37510, 37515, 37087, 37029 are all unmodified examples, 37667 (in DRS at Barrow Hill)...