| 单词 | block signal |
| 释义 | > as lemmasblock signal d. Railways. In sense 21, designating equipment, procedures, etc., connected with the working of a railway line as a series of block sections, as in block indicator, block signal, block telegraph, block working, etc.Cf. earlier block system n. at Compounds 4. ΘΚΠ society > travel > rail travel > railway system or organization > [noun] > types of signal system > types of signal switch-signal1838 semaphore signal1845 distance signal1848 home signal1857 block signal1864 dwarf signal1870 distant signal1874 switch-lantern1875 distant1881 spectacle1881 switch-lamp1898 banjo1902 peg1911 1865 W. H. Preece Brit. Patent 2016 4 There is no current passing through the distant signal apparatus which the switch apparatus is intended to control, and the block signal is consequently up. 1874 Pall Mall Gaz. 6 Mar. 5/1 Of the collision at Bowesfield Junction..the same inspector remarks that ‘it would not have occurred had block-working been in force, as it might and ought to have been’, between the two junctions. 1905 Westm. Gaz. 19 Apr. 8/1 He announced the fact..by sending to him the block telegraph bell-signal ‘Vehicles running away on right line’. 1936 Gloss. Terms Railway Signalling (B.S.I.) 9 The block indicator shows ‘Line Blocked’ or ‘Normal’, ‘Line Clear’ and ‘Train on Line’. 1940 Railroad Mag. Apr. 32/1 I explained that No. 39 was backing off the wye while No. 36 was standing at the block signal waiting for a clear track. 1978 G. M. Kichenside & A. Williams Brit. Railway Signalling (ed. 4) iii. 28 Block working from signal box to signal box..may be abolished where colour-light signals are installed and provided the line is equipped with continuous track circuiting. 2005 S. Hall Mod. Signalling Handbk. (rev. ed.) 53/2 In theory the train should be perfectly safe from any risk of another train running into the back of it, because the block signalling system should protect it. < as lemmas |
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