File:Four trains abreast--enormous traffic on the Penn. R'y, west of Altoona, Pa. Digital ID- (b&w film copy neg.) cph 3b39962 http- hdl.loc.gov loc.pnp cph.3b39962.jpg
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![File:Four trains abreast--enormous traffic on the Penn. R'y, west of Altoona, Pa. Digital ID- (b&w film copy neg.) cph 3b39962 http- hdl.loc.gov loc.pnp cph.3b39962.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/7/76/Four_trains_abreast--enormous_traffic_on_the_Penn._R%27y%2C_west_of_Altoona%2C_Pa._Digital_ID-_%28b%26w_film_copy_neg.%29_cph_3b39962_http-_hdl.loc.gov_loc.pnp_cph.3b39962.jpg/551px-thumbnail.jpg?20150110022530)
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