| Sr. No | Year | Milestones |
| 1 | 1853 | First Train inaugurated from Bori Bunder to Thane on 16 April |
| 2 | 1855 | BB&CI Railway Company incorporated by Act of British Parliament on 2 July, BB&CI signs agreement with British East India Company on 21 Nov to construct railway line from Surat to Baroda and Ahmedabad. |
| 3 | 1860 | BB&CI first section from Ankleshwart to Utran inaugurated |
| 4 | 1862 | Asias's first Narrow Gauge line opened between Dabhoi and Miyagam (Near Vadodara) |
| 5 | 1862 | BB&CI introduces worlds first Double Decker coaches |
| 6 | 1864 | BB&CI train reaches Mumbai, runs between Grant road to Valsad |
| 7 | 1867 | Local service commences between Virar and Back Bay on 12 April |
| 8 | 1896 | BB&CI reaches Delhi, links to GIP railway at Mathura |
| 9 | 1870 | CCG Station Opened |
| 10 | 1873 | Line extended to Colaba terminus |
| 11 | 1899 | BB&CI Headquarters building completed in January |
| 12 | 1928 | First electric suburbsn train ran from Colaba to Borivali |
| 13 | 1930 | Colaba station closed.CCG becomes the new suburban Terminus |
| 14 | 1951 | BB&CI renamed Western Railway on 5 November |
| 15 | 1961 | 9-coach suburban trains introduced on 3 March |
| 16 | 1972 | Mumbai-New Delhi Rajdhani introduced |
| 17 | 1972 | Total no. of suburban services crossed 500 (501 trains) |
| 18 | 1986 | 12 coach service started on DDR-VR section |
| 19 | 1992 | Worlds first Ladies Special service introduced on WR |
| 20 | 1992 | Exclusive Accommodation for Senior Citizens introduced in suburban trains |
| 21 | 1994 | CVMs introduced on WR |
| 22 | 2001 | Introducing of First DC/AC twelve car suburban service |
| 23 | 2002-03 | Western Railway reorganised |
| 24 | 2003 | Train Management system started on Mumbai Suburban |
| 25 | 2003 | Number of suburban services per day crossed 1000 |
| 26 | 2006 | First UTS started over suburban section |
| 27 | 2007 | Indian Railways' first ATVMs introduced on WR |
| 28 | 2007 | New state of the art EMU rake introduced on suburban section |
| 29 | 2009 | 15 car trains introduced |
| 30 | 2011 | 15 car trains extended till Churchgate |
| 31 | 2011 | Vileparle-Borivali section charged with 25KV-AC |
| 32 | 2012 | Last DC train ran on W.Rly on 5thFeb |
| 33 | 2012 | Churchgate-Vileparle section charged on 25KV AC current on 6thFeb |
| 34 | 2013 | 9 car services phased out from Main Line |
| 35 | 2013 | Suburban EMU trains extended up to Dahanu Rd |
| 36 | 2013 | 150thyear of arrival of trains on Western lines in Mumbai |
| 37 | 2013 | First premium AC special train between Mumbai-New Delhi route with dynamic pricing |
| 38 | 2014 | Fixed denomination windows for speedy dispersal of Suburban tickets |
| 39 | 2014 | Mobile ticketing launched on Mumbai Suburban Section |
| 40 | 2015 | India’s first suburban train with closing doors (in first class ladies coach) started |
| 41 | 2015 | New MUTP II Suburban rake put into service |
| 42 | 2015 | CVM closed |
| 43 | 2015 | WR comes on social media-Facebook, Twitter & Youtube |
| 44 | 2015 | First CCTV in ladies coach |
| 45 | 2015 | Paperless tickets through mobile |
| 46 | 2017 | New Suburban Rake with indigenous electrics under Make In India introduced on WR |
| 47 | 2017 | India’s first Air Conditioned suburban train introduced on WR on 25/12/2017 |
| 48 | 2018 | Harbour Line Extended from Andheri to Goregaon on 29/03/2018 |
| 49 | 2020 | Mumbai-Ahmedabad Tejas Express by IRCTC introduced on 17/01/2020 |
| 50 | 2020 | Indian Railways suspends all its passenger trains operations including suburban operations from 22 March, 2020 due to lockdown induced upon by COVID-19 pandemic |
| 51 | 2020 | WR starts Shramik Special trains for carrying migrants to their home states from 2ndMay, 2020 |
| 52 | 2020 | WR starts operation of its special trains i.e Mumbai-Delhi & Ahmedabad- Delhi Rajdhani Express w.e.f 12th May |
| 53 | 2020 | 17 more Mail/Express resumed services as special train w.e.f 1st June |
