This Directorate also has three wings, viz. Roads wing; NH wing; and Mechanical wing. The Department also has a well-established research-cum-training institute called the Roads & Building Research Institute (R&BRI) at Pailan on Diamond Harbour Road.This organisation is responsible for ensuring quality control in ongoing works; training of officers of different wings; and for research work. The Department proposes to further upgrade it and turn it into a major training institute of Eastern India. There are four PSUs under PWD, viz. West Bengal Highway Development Corporation Ltd(WBHDCL);Mackintosh Burn Ltd(MBL); Westinghouse Saxby Farmer's Ltd. (WSFL); and Britannia Engineering Ltd.(BEL). WBHDCL has been set up to undertake 4-laning works of State Highways and also for creation and construction of roads on PPP model. It has also completed several important projects and is in the process of undertaking some mega projects. MBL is essentially a construction company,with expertise in building and bridge projects. They are undertaking huge quantum of work on buildings and bridges of the Department as well as of other Government departments/PSUs. WSFL and BEL are basically engineering companies, which are under process of restructuring. Designations and career progression Recruitment A. West Bengal Senior Engineering Service (a) Engineer-in-Chief: The post of Engineer-in-Chief shall be filled up by selection from amongst Chief Engineer with at least one year of residual service on the date of occurrence of vacancy: Provided that a Selection Committee shall be made for selection to the post by order; (b) Chief Engineer: The post of Chief Engineer shall be filled up by selection from amongst the Superintending Engineer [including the posts which are designated as Superintending Engineer Recruitment (Selection Grade) and Assistant Chief Engineer] with at least one year of residual service on the date of occurrence of vacancy: Provided that a Selection Committee shall be made for selection to the post by order; (c) Superintending Engineer: The posts of Superintending Engineer (including the posts which are designated as Assistant Chief Engineer) shall be filled up by promotion from the rank of Executive Engineer (including the posts which are designated as Technical Assistant to the Superintending Engineer); (d) I. Executive Engineer (i) Subject to the provision of Sub-clause (ii), the posts of Executive Engineer (including the posts which are designated as Technical Assistant to the Superintending Engineer), shall be filled up by promotion from the rank of Assistant Engineer, provided that if sufficient number of Assistant Engineers suitable