Class 319 dual-voltage electric multiple-unit (EMU) number 319437 (previously 319037) comprised of 77362, 62927, 71808 and 77363 built by BREL York in 1987 or 1988 works 2E45 from Kentish Town to Sevenoaks on 19 November 2014 using 750 V direct current (DC) third rail. From the start of the Govia Franchise (14 September 2014) 24% of Govia Thameslink Railway services were delayed between 12 October 2014 and the 8 November 2014. Between 9 November and 6 December 2014 this improved slightly with only 21.3% being delayed but a further 4% were cancelled. Govia attribute this to train failure of old and new rolling stock and infrastructure problems e.g. <a href="https://www.flickr.com/photos/99279135@N05/15583827068/">track circuit failure</a>, while the watchdog London TravelWatch were also concerned about the lack of train drivers e.g. "<a href="https://www.flickr.com/photos/99279135@N05/14975418773/">an issue with the train crewe</a>" across the franchise. During the previous franchise First Capital Connect (FCC) had Alstoms TrainTracer on-board monitoring module added to the Train Control & Management System (TCMS) and Traction Control racks of all class 319s. This module monitors major components and reports data for developing faults and non-critical failures to a ground-based server for engineers to remotely analyse with maintenance management software and plan maintenance. GPS data collected also allows them to identify the precise location where a fault has occurred. Alstom claim that through this planned maintenance the amount of time trains are unavailable for use is reduced by 30%.

According to Realtime Trains the route and timings were; Kentish Town [KTN] 1........1456.........................1456...........................RT Dock JunctionNorth..........1457 1/2...................1457 1/4.....................RT St Pancras International...1459/1500...............1459/1500................RT Farringdon [ZFD] 3............1504 1/2/1505 1/2..1503/1504 3/4.........RT London Blackfriars 1..........1511/1512..................1510 1/2/1512............RT Elephant & Castle 4...........1515/1516.................1515/1516..................RT Denmark Hill [DMK] 4........1521 1/2/1522 1/2...1521/1522.................RT Crofton Road Junction.....1523 1/2...................1523 1/4....................RT Peckham Rye [PMR] 4.......1524 1/2/1525.........1524 3/4/1525 1/2...RT Nunhead [NHD] 2..............1527/1527 1/2.........1527 3/4/1528 3/4...1L Catford [CTF].......................1532 1/2/1533.........1533/1534..................1L Bellingham [BGM]..............1535/1535 1/2.........1536 1/4/1537...........1L Shortlands Junction..........1540 1/2...................1542 1/2....................2L Shortlands [SRT].................1541/1541 1/2...........1543 1/2/1544 1/2.....3L Bromley South [BMS] 3.....1543 1/2/1544 1/2...1545 1/2/1546...........1L Bickley Junction[XLY].......1548.........................1550 1/2....................2L St Mary Cray Junction......1549.........................1551 1/2.....................2L Swanley [SAY] 2.................1555.........................1558...........................2L Otford Junction[XOT].......1608.........................1610 3/4....................2L