Telescoping, however, was an incident of crushing, and a peculiarly American incident, which is not without a certain historical interest; for the particular feature in car construction which led directly to it and all its attendant train of grisly horrors furnishes a singular and instructive illustration of the gross violations of mechanical principles into which practical, as opposed to educated, mechanics are apt constantly to fall,--and in which, when once they have fallen, they steadily persist. The original idea of the railroad train was a succession of stage coaches chained together and hauled by a locomotive. The famous pioneer train of August 9, 1831, over the Mohawk Valley road was literally made up in this way, the bodies of stage coaches having been placed on trucks, which "were coupled together with chains or chain-links, leaving from two to three feet slack, and when the locomotive started it took up the slack by jerks, with sufficient force to jerk the passengers, who sat on seats across the tops of the coaches, out from under their hats, and in stopping they came together with such force as to send them flying from their seats." On this trip, it will be remembered, the train presently came to a stop, when the passengers upon it, with true American adaptability, set their wits at once to the work of devising some means of remedying the unpleasant jerks.[4] "A plan was soon hit upon and put in execution. The three links in the couplings of the cars were stretched to their utmost tension, a rail, from a fence in the neighborhood, was placed between each pair of cars and made fast by means of the packing yarn from the cylinders." Here was the incipient idea of couplers and buffers improvised by practical men, and for a third of a century it remained almost unimproved upon, except by the introduction of a spring upon which coupler and buffer played. The only other considerable change made in the earlier days of car construction was by no means an improvement, inasmuch as it introduced the new and wholly unnecessary danger of telescoping. [4] Railroads: their Origin and Problems, p. 49.