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  2. Air horn - Wikipedia

    en.wikipedia.org/wiki/Air_horn

    In most horns it also determines the pitch of the sound. When vibrated by the diaphragm, the column of air in the horn vibrates in standing waves. The length of the horn determines the wavelength of the sound waves generated, and thus the fundamental frequency (pitch) of the note produced by the horn. The longer the horn, the lower the pitch.

  3. Amtrak's 25 Hz traction power system - Wikipedia

    en.wikipedia.org/wiki/Amtrak's_25_Hz_traction...

    Amtrak Avelia Liberty trainset operating under the 25 Hz traction power system near Claymont, Delaware. Amtrak's 25 Hz traction power system is a traction power network for the southern portion of the Northeast Corridor (NEC), the Keystone Corridor, and several branch lines between New York City and Washington D.C.

  4. Buffers and chain coupler - Wikipedia

    en.wikipedia.org/wiki/Buffers_and_chain_coupler

    Narrow gauge flat wagons, 750 mm (2 ft 5 + 1 ⁄ 2 in).Note the single buffer with a hook on the right side and a chain on the other. On some narrow-gauge lines in Europe, and on the Paris Metro, a simplified version of the loose-coupler is used, consisting of a single central buffer with a chain underneath.

  5. Train whistle - Wikipedia

    en.wikipedia.org/wiki/Train_whistle

    One of two (front and rear) whistles on steam locomotive 60163 Tornado. A train whistle or air whistle (originally referred to as a train trumpet or air trumpet) is an audible signaling device on a steam or gas locomotive, used to warn that the train is approaching, and to communicate with rail workers.

  6. Power inverter - Wikipedia

    en.wikipedia.org/wiki/Power_inverter

    Modified sine wave produced by a cigarette lighter 12 volt DC to 120 V AC 60 Hz inverter. The modified sine wave is the sum of two square waves, one of which is delayed one-quarter of the period with respect to the other. The result is a repeated voltage step sequence of zero, peak positive, zero, peak negative, and again zero.

  7. Portland Head Light - Wikipedia

    en.wikipedia.org/wiki/Portland_Head_Light

    Portland Head Light is a historic lighthouse in Cape Elizabeth, Maine.The light station sits on a headland at the entrance of the primary shipping channel into Portland Harbor, which is within Casco Bay in the Gulf of Maine.

  8. PRR MP54 - Wikipedia

    en.wikipedia.org/wiki/PRR_MP54

    The Pennsylvania Railroad's MP54 was a class of electric multiple unit railcars. The class was initially constructed as an unpowered, locomotive hauled coach for suburban operations, but were designed to be rebuilt into self-propelled units as electrification plans were realized.

  9. List of Milwaukee Road locomotives - Wikipedia

    en.wikipedia.org/wiki/List_of_Milwaukee_Road...

    Converted to freight class EF-1 in 1920. In 1950, two boxcab two-unit sets were converted for passenger service (class EP-1A). Milwaukee Road class EP-2 - The "Bi-Polars". 5 built by GE in 1919. Milwaukee Road class EP-3 - The "Quills" (quill drive). 10 built by Baldwin/Westinghouse in 1919. Milwaukee Road class EP-4 - "Little Joes". Two ...