. Railroad structures and estimates . KBolt 9*1 9 Sawn Tiea uo Ig. Fig. 204. C. P. R. Standard Mail Crane. 424 MAIL CRANES. At the top of the post about three-foot centers two horizontalarms project 3 ft. towards the track arranged to hold the mailbag. The arms have a steel spring attachment at the post endso that when the bag is released they automatically rise andfall towards the post, one going up and the other down. () A light iron ladder is placed for convenience of the operator,so that he may be able to catch the arms and tie the mail bag inposition. Approximate cost of an iron m
. Railroad structures and estimates . KBolt 9*1 9 Sawn Tiea uo Ig. Fig. 204. C. P. R. Standard Mail Crane. 424 MAIL CRANES. At the top of the post about three-foot centers two horizontalarms project 3 ft. towards the track arranged to hold the mailbag. The arms have a steel spring attachment at the post endso that when the bag is released they automatically rise andfall towards the post, one going up and the other down. () A light iron ladder is placed for convenience of the operator,so that he may be able to catch the arms and tie the mail bag inposition. Approximate cost of an iron mail crane complete, $35. The relation of the mail crane to the mail car is shown, , and the design of the catcher across the door of the car,Fig. 206; the catcher is operated by the mail clerk pulling theupper handle which brings it into a horizontal position ready toengage and catch the bag suspended on the mail crane. Onreleasing the handle the catcher drops down into a verticalposition as shown on the ELEVATION OF MAIL CRANE & TRACKIN RELATION TO MAIL CAR Fig. 205. PLANMail Catchor in use Fig. 206. TRACK TANKS. 425 Track Tanks. — Track tanks are used to a limited extent,and usually consist of steel troughs placed directly on the ties, tohold the water so that locomotives can scoop up a supply whilein motion, and are used for passenger and freight service toexpedite train movement on congested districts. A compreiionsive article on this type of structure is given in de-tail in the Railroad Gazette, March 13, 1908, by H. H. Ross. The tanks must be located where the supply of water is abun-dant and of good quality; 15 to 50 per cent of the water is wastedby being forced out over the sides and ends b} the engine speed for satisfactory service is from 25 to 30 miles perhour, and the tracks are graded at the approaches to enable thenecessary speed to be made, and for this reason track tanksshould be away from any structures, crossings, yards, etc.,
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