Steam locomotive sheds used to exist at Arrokonam until the late 1970s. After Southern Railway set a deadline to eliminate all steam locomotive operations by 1990, a push was given towards establishing electric locomotion as the primary motive power, and the Steam locomotive shed was decommissioned. To meet the needs of exponentially increasingrail traffic on the new continuous broad gauge lines from Chennai to Kanyakumari and Palakkad with the completion of gauge conversion, the steam shed site was selected by Indian railways for a new electric locomotive shed. New Electric locomotive shed was inaugurated in the 1980s with WAM-4 class.This shed then got 5 WAP-1 from Ghaziabad which stayed until 2002, when they were transferred back to Ghaziabad again. It later got the entire Southern Railway fleet of WAP-4 locos. Later these were then moved to Erode and Lallaguda. New WAG-7 locos were acquired but later transferred to Erode. In 2009 30 WAP-1 locos transferred back from Ghaziabad out of which all but 5 were sent to Royapuram in 2011. All the WAM-4s of this shed have been retired/withdrawn from service.
Operations
Being one of the three electric engine sheds in Southern Railway, various major and minor maintenance schedules of electric locomotives are carried out here. It has the sanctioned capacity of 150 engine units.This shed houses a total of 174 engine units, including 90 WAP-4 and 84 WAG-5. Electric loco Shed, Erode is now housing the 2nd largest fleet of WAP-4 in Indian Railways and it caters to many long distanceelectric trains. Like all locomotive sheds, AJJ does regular maintenance, overhaul and repair including painting and washing of locomotives. It not only attends to locomotives housed at AJJ but to ones coming in from other sheds as well. It has four pit lines for loco repair. Locomotives of Arakkonam ELS along with Erode and Royapuram ELS were the regular links for all trains running through Kerala and Tamil Nadu when widespread electrification of railway lines started in Southern Railways. It handled prestigious trains like the Kerala Express, and the Tamil Nadu Express. AJJ locomotives used to be predominantly the regular links for trains traveling to north as well.
