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I


IMLEC
International Model Locomotive Efficiency Competition
Improver
Someone in the later stages (final year?) of his apprenticeship.
In-Advance
Further in the direction in which a train is travelling. This term always apply to the driver’s viewpoint from his footplate. The next signal (or signal box) he reaches is in advance of him.
In-Rear
In the direction from which a train has come. This term always apply to the driver’s viewpoint from his footplate. The last signal (or signal box) he passed is in rear of him.
Indicated Horse Power (IHP)
the power exerted in the cylinder of an engine, stated in horse powers, estimated from the diameter and speed of the piston, and the mean effective pressure upon it as shown by an indicator.
Injector
A device for using steam pressure to force feed-water into the boiler. Some designers preferred to use pumpsExplain 'Water Pump' because injectors were temperamental (therefore two were usually fitted) and originally they would work only with cold water.
Inside Admission Valve
Inside admission refers to piston valvesExplain 'Piston Valve' where the steam inlet is between the two valve pistons, the exhaust being outside of the two valves.
Inside Cylinders
CylindersExplain 'Cylinder' that reside inside the engine framesExplain 'Frame'. This requires the use of Cranked-AxleExplain 'Crank Axle' to transmit the power from the cylinder piston to the driving wheelsExplain 'Drive Wheel'.
Inside-Frame
The most usual arrangement was to have the frames inside the wheels. A few locomotives had double frames, or outside frames.
Inspector
A supervisory but non-managerial grade (equivalent to an Army NCO) whose job was to monitor the performance of staff or processes. Those most likely to come into contact with the public were the Ticket Inspectors, but there were Inspectors (supervisors) for most railway occupations such as SignallingInspectors, Locomotive Drivers’ Inspectors and the like.
Instanter coupling
A couplingExplain 'Coupling' similar to the Three-Link couplingExplain 'Three Link Coupling' but with a pear shaped middle link, with irregularities that enable it to hold fast whether in a horizontal (long) or vertical (short) position and allow the shunter’s pole to lever them into either position. The short form holds the vehicles closer together while running, while the long form makes coupling and uncoupling easier.
Inter-district Train
A medium-distance secondary train (often but not always formed of non-corridor or possibly lavatory stock) which ran through or between termini in two different Traffic Districts, and thus was the operating responsibility of both of them. After WW1 the LNWR designated a large number of trains as “Inter-District Sets” which were intended to be “general purpose” and hence improve flexibility and utilisation. Main line express and purely local train sets were organised differently.
Interlocking
A means of physically preventing apparatus (e.g.. points, signals) from being placed in potentially dangerous positions, particularly preventing one device being moved unless others are in the correct position.
Invalid Saloon
A special coach, fitted with bed, armchairs, wheel chair etc, which could be chartered to convey (wealthy) invalids or disabled persons and their attendants.
Irish Mail
The Euston-Holyhead and Holyhead-Euston boat trains which connected with the Holyhead-Kingstown (now Dun Laoghaire) steam packets, and carried mail to and from Ireland under government contract. The day Irish Mails left Euston at 8.30 (which became 8.45 during the 1930s under the LMS) and Holyhead at 17.30; the night Irish Mails left Euston at 20.45 and Holyhead at 0.07. These trains were named even under the LNWR (which was not given to naming trains). To enable the trains to run non-stop from Chester to Holyhead and vice versa, the first water troughsExplain 'Water Trough' were laid at Mochdre, on the North Wales coast.
Ivatt, Henry Alfred (1851—1923)
At age 17 apprenticed at Crewe under RamsbottomExplain 'Ramsbottom, John (1814—1897)' and WebbExplain 'Webb, Francis William (1836—1906)'. Locomotive Superintendent of the Great Northern RailwayExplain 'Great Northern Railway (GNR)' from 1896 to 1911.
Ivatt, Henry George (1886—1972)
Son of H.A. Ivatt. Chief Mechanical EngineerExplain 'CME' from 1945 to 1947 for the London, Midland & Scottish RailwayExplain 'London Midland & Scottish (LMS)' and then for British RailwaysExplain 'British Rail' (London Midland Region) until 1951.
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