If speaking to a general audience is the important thing, a talk from the outside of the train would seem better than crowding people into the cars; but even outside speeches from the platform or a flat car, or an especially built platform at the train present many difficulties. The location of the train frequently does not provide good standing room for the crowds; there is frequently distraction from the noise of other trains and persistent rainy weather must be reckoned with also. It is very important to have speakers with good outdoor voices, for the effect on the audience of straining to hear a speaker is irritating and leaves behind a bad impression. VII EXHIBIT CARS TYPES OF CARS Practically every type of car from the Pullman to the flat car can be fitted up to suit some exhibit or demonstration purpose. The Pullman, with its broad windows and attractively finished woodwork, makes a more pleasing setting for displays than the day coach. The day coach with seats removed and shelves built in for the display of exhibits has been the most generally used type of car. Photographs of the Pennsylvania Food Conservation Train show day coaches with interiors fitted up with counters, platforms, and cupboards with dimensions based on a careful calculation of the desired use of every inch of floor and wall space.[7] The baggage car is more nearly ready for use in an emergency since it does not need to be dismantled, but it is neither so well lighted nor so well finished as the coach. The flat car is well adapted to a display of large and heavy equipment, or for demonstrations that, require a platform to display them to an audience standing near the track. On agricultural trains, demonstrations of milking or judging live stock have been given on flat cars. On the Liberty Loan trains flat cars were employed to show cannon, machine guns, tanks, and other large equipment. In the photograph opposite page 80 a flat car is shown fitted with a framework for a tarpaulin for protection against weather. This is a necessary precaution in using flat cars.