. Railroad structures and estimates . oncreteand the paving blocks are laid on a 1-in. sand cushion. Highway Crossing Alarm Bell. (Fig. 107.) — At highwaycrossings where traffic does not warrant a watchman or safetygates, an electric alarm bell attached to the road-crossing sign,or erected on a special iron or wood pole, is often used, arrangedso as to ring ahead of an approaching train; a light also is some-times provided above the bell. The track rail joints are bondedfor a distance of 1000 to 3000 ft. on either side the crossing andinsulated for battery and bell circuit, a battery being nec
. Railroad structures and estimates . oncreteand the paving blocks are laid on a 1-in. sand cushion. Highway Crossing Alarm Bell. (Fig. 107.) — At highwaycrossings where traffic does not warrant a watchman or safetygates, an electric alarm bell attached to the road-crossing sign,or erected on a special iron or wood pole, is often used, arrangedso as to ring ahead of an approaching train; a light also is some-times provided above the bell. The track rail joints are bondedfor a distance of 1000 to 3000 ft. on either side the crossing andinsulated for battery and bell circuit, a battery being necessaryat each end of the bonded track and one at foot of bell post. Average cost for installing crossing gates $700 Expense of flagman per annimi, averages 600 Installing signal bells, each averages 500 Annual maintenance for each bell 100 Cost of installing gate protection, averages 475 Cost of installing automatic flagman, averages 600 Annual maintenance charge for each, averages 100 See Detail X-18-11 I Volt 3 Lamps. Tjettered on both sides Fig. 107. Highway Crossing Signand Alarm Bell. Track Battery [
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Keywords: ., bookcentury1900, bookdecade1910, bookidrailroadstructur00orrouof
