is headed by Member Infrastructure (ex officio Secretary to the Govt. of India) which is the highest specialized post for an IRSE officer. Theoretically, an IRSE officer is on duty 24 hours a day, 365 days a year . Organisation There are about 1958 serving officers in the IRSE. The management of department has three levels. Apex level This level dictates major policies pertaining to India’s rail infrastructure. At its helm at the Ministry/Railway Board level is the M-Infra (Member-Infrastructure) & ex-officio Secretary to the Government of India, who works in tandem with dedicated Special Secretary to the Government of India ranking Additional Members for Civil Engineering, Works, Bridges, Station Development, and Land & Amenities in addition to Principal Executive Directors and Executive Directors holding the rank of Additional Secretary and Joint Secretary to the Govt of India respectively. Zone level The Indian Railways has 18 Zonal Railways with an average track length of about 4000 km and average staff strength of about 80,000 headed by GMs. The Zonal Organizational structure of Engineering department is headed by the Principal Chief Engineer (PCE) ranked equivalent to an Additional Secretary in the Union Govt, with various designated Chief Engineers (equivalent to Joint Secretaries to the Govt of India) for track, bridge, planning, track machines, general matters etc. In addition, each Zonal Railway has a construction unit headed by a Chief Administrative Officer who is ranked at par with an Additional Secretary to the Govt of India. He is responsible for major construction works such as new lines, doubling, gauge conversions etc. He works in unison with a number of chief engineers (construction), who hold the rank of Joint Secretaries to the Govt of India. Division level Each Zone is divided into 3-7 Divisions each with an average track length of about 1000 km and staff strength of about 15000 headed overall by DRM (Divisional Railway Manager). These are basic units for execution of works. At this Level, the Engineering department is headed by Sr.DEN/C (Senior Divisional Engineer, Co-ordination). A division consists of 2 to 5 sections which are managed by a sectional Sr.DEN (Senior Divisional Engineer) or DEN (Divisional Engineer). A new probationer joins as Assistant Divisional Engineer and commands about 500 to 1000 staff spread over 200 km of jurisdiction. Training The initial and refresher training of IRSE is done at Indian Railways Institute of Civil Engineering, Pune. See also Centralised