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  2. Railroad switch - Wikipedia

    en.wikipedia.org/wiki/Railroad_switch

    A right-hand railroad switch with point indicator pointing to right Animated diagram of a right-hand railroad switch. Rail track A divides into two: track B (the straight track) and track C (the diverging track); note that the green line represents direction of travel only, the black lines represent fixed portions of track, and the red lines depict the moving components.

  3. Wye (rail) - Wikipedia

    en.wikipedia.org/wiki/Wye_(rail)

    The sharp curves of the triangle, and especially the turnouts on those sharp curves, restrict train speeds to between 10 and 50 km/h (6.2 and 31.1 mph). Near Hamilton station on the Central Coast and Newcastle line there is a wye for freight trains and regional trains. This puts them directly on the Main Northern line.

  4. Copper tubing - Wikipedia

    en.wikipedia.org/wiki/Copper_tubing

    Except for this difference between ACR (types A and D) and plumbing (types K, L, M, and DWV) pipes, the type only indicates wall thickness and does not affect the outside diameter of the tube. Type K 1 ⁄ 2 inch, type L 1 ⁄ 2 inch, and type D 5 ⁄ 8 inch ACR all have the same outside diameter of 5 ⁄ 8 inch.

  5. Piping and plumbing fitting - Wikipedia

    en.wikipedia.org/wiki/Piping_and_plumbing_fitting

    Valves stop (or regulate) the flow of liquids or gases. They are categorized by application, such as isolation, throttling, and non-return. Isolation valves temporarily disconnect part of a piping system to allow maintenance or repair, for example. Isolation valves are typically left in either a fully open or closed position.

  6. Tube socket - Wikipedia

    en.wikipedia.org/wiki/Tube_socket

    Before alternating current (AC) line/mains-powered radios were developed, some four-pin tubes (in particular, the very common UX-201A ('01A)) had a bayonet pin on the side of a cylindrical base. The socket used that pin for retaining the tube; insertion finished with a slight clockwise turn.

  7. Digital model railway control systems - Wikipedia

    en.wikipedia.org/wiki/Digital_model_railway...

    TMCC utilizes the same command codes as Digital Command Control (DCC). However, unlike DCC, it uses a 455 kHz radio transmission to carry the command codes separate from track power. The locomotive decoders are dependent on AC track power (50 or 60 Hz) to synchronize the command receiver. Thus, TMCC can only operate on AC track power.

  8. Flexible AC transmission system - Wikipedia

    en.wikipedia.org/wiki/Flexible_AC_transmission...

    From the above equations, it can be seen that there are three variables that affect real and reactive power flow on a Transmission Line: [12] the voltage magnitudes at either bus, the line reactance between the buses, and the voltage phase-angle difference between the buses. All FACTs devices operation on the fundamental principal that changing ...

  9. Internally grooved copper tube - Wikipedia

    en.wikipedia.org/wiki/Internally_grooved_copper_tube

    In a design study of functionally equivalent 5 kW HVAC heat exchangers, tube materials in the coils weighed 3.09 kg for 9.52 mm diameter tube, 2.12 kg for 7 mm diameter tube, and 1.67 kg for 5 mm diameter tube. Tube weight was reduced by 31% when copper tube diameters were downsized from 3/8 inch to 7 mm. Tube weight was reduced by 46% when ...

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