The orchestral wood-block instrument of the West is generally made from teak or another hardwood.
2.
When the exhibition closed after the summer the station was dismantled and the four block instruments sold off.
3.
The accident occurred in thick fog and was caused by irregular block instrument operation by the signalman at Barnes Junction.
4.
The clerk at Wellow had already sent the " down " stock train on, but without using his block instruments to alert Dando.
5.
The latter box was normally unstaffed, and it was operated by hydraulic power from the staffed box, which contained the block instruments.
6.
A contributory factor was the use of two-position block instruments, which did not have distinct " Line Blocked " and " Line Clear " indications.
7.
The first signalling systems were made possible by technology like the telegraph and block instrument that allowed adjacent signal boxes to communicate the status of a section of track.
8.
However, Bloor forgot that the local train was standing at his signals, and thought that he had failed to clear his block instruments after a preceding train.
9.
To accommodate both the standard gauge trains of the GNR and the broad gauge trains of the GWR, the track was three-rail Spagnoletti block instruments and fixed signals.
10.
The Block instruments were interlocked with the signal levers so that unless the respective instrument stood at'line clear', they could not be cleared to accept a train.
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