English: Govia Thameslink's class 387 Electrostar dual voltage electric multiple unit (EMU) number 387118 comprised of coaches 421118, 422118, 423118 and 424118 with Thameslink branding works 1G79 from Beckenham Junction to Bedford on 19 August 2015. Class 387 EMUs are being temporarily used on this Thameslink route as an interim measure to replace class 319 EMUs that were transferred to Northern Rail. It is said that use of Class 387s will continue until the delayed class 700 EMU contract is delivered at which point the class 387 EMUs will be transferred to First Great Western. 387118 was built by Bombardier Transportation (previously ADtranz) being assembled at Litchurch Lane Works, Derby and entered service on 29 January 2015.

According to HE TSC the full diagram for the two units on this day was; 2W84...01:16.....Three Bridges to Bedford 5G84....03:46...Bedford to Bedford CS 5G04....04:34...Bedford CS to Bedford 1W03....04:46...Bedford to Brighton 1W14......07:48...Brighton to Bedford 2W31.....10:40....Bedford to Three Bridges 2W38....13:14.....Three Bridges to Bedford 1H66......15:40...Bedford to Beckenham Junction 1G79......17:30....Beckenham Junction to Bedford 1W61......19:26....Bedford to Brighton 1W72.....22:30...Brighton to Bedford 5G72.....01:28....Bedford to Bedford CS

It was also photographed later in the evening by 96tommy at St Pancras International while working 1W61 19:26 from Bedford to Brighton.

According to Realtime Trains the route and timings were; Beckenham Junction 4.....1730.........................1730 3/4....................RT Kent House [KTH] 2...........1732 1/2/1733.........1733 1/2/1733 3/4....RT Sydenham Hill [SYH]..........1737 1/2/1738.........1738/1739...................1L Herne Hill [HNH] 2..............1742 1/2/1744.........1743 3/4/1748 3/4....4L Loughborough Junction...1747/1747 1/2.........1750 1/4/1751 3/4......4L Elephant & Castle 1.............1751/1752................1754/1754..................2L London Blackfriars 2..........1755/1756...............1757/1759..................3L City Thameslink [CTK] 1.....1757 1/2/1758 1/2..1800/1802.................3L Farringdon [ZFD] 4.............1800 1/2/1801 1/2..1803/1804..................2L St Pancras International....1805/1806 1/2........1808/1809.................2L Dock JunctionNorth...........1808........................1811..............................3L Kentish Town [KTN] 2........1809 1/2..................1813.............................3L Kentish Town Junction......1810 1/2...................1813 1/4.......................2L Carlton Road Junction.......1811 1/2....................1814 1/2.......................3L West Hampstead Sth Jn...1813..........................1818.............................4L W. H'stead Thameslink......1813 1/2...................1818 1/2.......................5L W. Hampstead Nth Jn........1813 1/2...................1818 1/2.......................5L Cricklewood South Jn.......1814..........................1818 3/4......................4L Cricklewood [CRI] 4...........1814 1/2...................1819 1/2.......................5L Cricklewood Curve Jn.......1814 1/2...................1819 1/2.......................5L Brent Curve Junction.........1815..........................1820............................5L Hendon [HEN] 4..................1815 1/2...................1820 3/4.....................5L Silkstream Junction............1816..........................1821 1/4.......................5L Mill Hill Broadway 4............1817..........................1822 1/2.....................5L Elstree&Borehamwood.....1819..........................1825............................6L Radlett [RDT] 4....................1820 1/2..................1826 3/4.....................6L R. Redland Roadstone.......1821 1/2...................1827 1/4......................6L St Albans [SAC] 4................1824 1/2/1826........1830 1/4/1831 3/4.....5L Harpenden Junction..........1830 1/2..................1837 1/4......................6L Harpenden [HPD] 2............1831 1/2/1832 1/2...1838 1/4/1839 1/4.....6L Luton Airport Parkway 2...1837 1/2/1838 1/2..1844 1/4/1844 3/4.....6L Luton [LUT] 3.......................1840 1/2/1841 1/2...1846 3/4/1847 1/2....6L Luton North Junction.........1842 1/2..................1848............................5L Leagrave [LEA] 2.................1844 1/2/1845........1850 1/2/1851 1/4......6L Leagrave Junction..............1845 1/2..................1851 1/2.......................6L Harlington [HLN] 2..............1849 1/2/1850........1855 3/4/1856..........6L Flitwick [FLT] 2....................1853 1/2/1854........1859 1/4/1859 3/4....5L Flitwick Junction.................1855.........................1900 1/2.....................5L Bedford South Junction....1902........................1907 1/2......................5L

Bedford [BDM] 2.................1906........................1910 3/4......................4L