Operator Nexus says driver availability is limited due to action by the RMT union, which began on Sunday, December 1.
It has withdrawn one train operating between Monument and South Shields; and South Shields and South Gosforth.
Nexus says the changes mean there will be gaps in service and trains will be particularly busy.
It is asking passengers to leave extra time for their journey or travel outside peak hours if possible.
Most Popular
-
1
Sunderland at Wembley: Fans raise 'virtual tip jar' fundraising target to thank staff at Covent Garden pub after smashing original total
-
2
19 Sunderland locations hosting Queen's Platinum Jubilee street parties
-
3
Police appeal for help in finding missing Sunderland man Anthony Scott
-
4
Sunderland at Wembley: London pub landlord thanks SAFC fans for ‘bumper weekend’ after League play-off final victory over Wycombe Wanderers
-
5
Sunderland at Wembley: 'We're looking forward to welcoming them back next year' says brewery boss as fans' behaviour in Trafalgar Square praised
On Thursday, there was also a 20-minute gap in service between Airport and South Hylton due to a train being withdrawn.
This was reported between 6.30am and 7.30am.
The following peak services are affected by the action.
Morning Peak Services
6:52am South Gosforth - Pelaw
7:20am Pelaw - Monkseaton
8:05am Monkseaton - Pelaw
8:56am Pelaw – Monkseaton
7:04am South Gosforth - Pelaw
7:32am Pelaw - Monkseaton
8:17am Monkseaton - Pelaw
9:08am Pelaw - Monkseaton
7:13am Regent Centre - Pelaw
7:44am Pelaw - Monkseaton
8:29am Monkseaton - Pelaw
9:14am Pelaw - South Gosforth
6:42am Longbenton - Monkseaton
7:05am Monkseaton - Pelaw
7:56am Pelaw - Monkseaton
8:41am Monkseaton - Pelaw
9:26am Pelaw - South Gosforth
7:07am Longbenton - Monkseaton
7:29am Monkseaton - Pelaw
8:20am Pelaw - Monkseaton
7:19am Longbenton - Monkseaton
7:41am Monkseaton - Pelaw
8:32am Pelaw - Monkseaton
Afternoon Peak Services
3:40pm Benton - Pelaw
4:20pm Pelaw - Monkseaton
5:05pm Monkseaton - Pelaw
5:51pm Pelaw - Benton