Looking into the workings for the 60/61/42 on Sundays. I think, similarly the 202/265/259/260 workings, the three services will interwork together

If you look at the times, (shows layover at Sunderland Interchange)
10:20 42 to Sunderland Interchange arriving at 10:39 (8)
10:47 60 to Parkside Heathway arriving 11:19
11:20 60 to Sunderland Interchange Arriving 11:53 (7)
12:00 61 to Murton/Sunderland Interchange arriving back at 1:06 (11)
1:17 42 to Vicarage Farm Estate arriving at 1:39
1:40 42 to Sunderland Interchange arriving 1:59 (8)
2:07 60 to Parkside Heathway arriving 2:39
2:40 60 to Sunderland Interchange arriving 3:13 (14)
3:27 60 to Parkside Heathway arriving 3:59
4:00 60 to Sunderland Interchange arriving 4:33 (4)
4:37 42 to Vicarage Farm Esatate arriving 4:59
5:00 42 to Sunderland Interchange arriving at 5:19 (11)
5:30 61 to Murton/Sunderland Interchange arriving back at 6:32

This is just some rough working outs I think it works?!