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(6) These silos sit atop the monolithic pedestal, Cast within tf~e pedestal are three 36" square openings per silo, of which of this time only the center opening is being used for loading operation by an air-operated clamshell door. The extra two openings were cast in case of bridging of pit run materials, which did not occur, (7) Bin indicators of Western Paving design and Syntron diaphragms were installed. (8) All elements, other than the dragline or loader operation, are tied in to a Square D programmable sequence controller, including the positioning of the shuttle conveyor for proper silo loading, the warn- ing system and the dump system. (9) Railroad sidings were constructed by Southwestern Railway (:o, 1,800' is at W~P, and 2,300' at Clear Creek Spur. The main line: was already in, (10) Dump System. The dump system is manually energized and tl~e contra e~uts the doors after 9 seconds. Three 4-second jerks per silo are necessary to fill the cars. Six cars are loaded at once, C. to C. of the silos is the same as the C. to C. of the cars. Thus, we are talking about 27 seconds of material flow for 600 tons of material. The actual loading time is l2 to 15 minutes for the 30- car train. (11) Bul•lington-Northern --Colorado 8~ Southern R.R. The B~N~-C&5 have four crewmen, inc uding the engineer. The ra eman has radio contact with the engineer, and he is stationed at the silos observing the loading and positioning of the cars. Total time at the site approxi- mates 30 minutes, (12) The three, SD-9, 1750 H.P. per each engine, travels the 43- mile trip from Western Spur, Colorado (the location of the silos at Lyons) to Clear Creek Spur at Western Paving's Denver asphalt facilities. A 263' trestle w?h six 1500 ton capacity bays, was constructed with prestressed concrete girders. This design was chosen because of its rigidness and the lack of diaphragms neces- sary between the girders. The diaphragms would have had a high~- wear rate. (13) Ortner Freight Cars. The Ortner Automatic Air-Operated Raid Discharge Cars, with 24 volt solenoid signaling system were chosen after a test car with this material was demonstrated for Western Pa•iing, which showed that it was a very rugged car and dumped very cleanly and quickly, and had the 'heavy-dutiness' for a long life. The strength has to be a very important element, when up to 10" pit run is flowing into the car at a 200 ton per minute plus rate, -2-