modfather Posted May 8, 2010 Share Posted May 8, 2010 The prototype railway works on planned preventative maintenance basis. This is intended to prevent problems occuring by focussing maintenance on areas where attention is required. Typically this includes consumables, clearing up contamination, and lifed items of equipment. Normally it is the life of the consumable components that dictates the frequency of the smaller exams. Typically including fuel, brake blocks/pads, oils and coolant, and filters. Often a very limited check is carried out when a train is fuelled. Maintenance schedules for diesel electric power trains is based upon 'duty hours', taken from a counter fitted since the 1960's to the engine run solenoid and recorded regularly on TOPS. There are now two ways in which this information can be made into a maintenance schedule; balanced and accumulative. Generally BR worked to an accumulative basis which lead to fluctuations in availibility. Presently, a balanced schedule will be used so that major exams are staggered across the fleet. The conventional system of identifying exams it to use letters. A typical schedule for a class 47 is as shown below. AAAA BBC BBD BBC BBD BBC BBE (with A exams interposed) This means that there will be four A exams, then a B, followed by four A exams and another B. After another cycle of A exams, a C exam would be carried out and so on. The basic A exam in this case is carried out after 55 working hours, all other exams being at a multiple of this E.g. the B exam at 275 hours. The balanced schedule distributing major tasks across each exam, giving consistent down time at each service interval. BR suggested for class 47s the service intervals as follows: 1955 1980 Ax Daily 5-8 days Bx 7 Days 32-36 days Cx 28 days 96-107 days Dx 84 days 311-320 days Ex 168 days 954-964 days I suspect this will raise more questions than it answers... Matt Link to post Share on other sites More sharing options...
St. Simon Posted May 8, 2010 Share Posted May 8, 2010 Hi, It also might be of interest to people to look at my work experience with Chiltern Railways blog: http://www.rmweb.co.uk/community/index.php/blog/424-work-experience-at-chiltern-railways/ This contains some infomation on mostly B exam work, but also some repair work aswell. Simon Link to post Share on other sites More sharing options...
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