. Railroad structures and estimates . o. (280) 290 HIGHWAY CROSSING BELL. under the track and is sloped off on either side 1 in 10 longi-tudinally. The ties over the crossing are embedded in concreteand 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
. Railroad structures and estimates . o. (280) 290 HIGHWAY CROSSING BELL. under the track and is sloped off on either side 1 in 10 longi-tudinally. The ties over the crossing are embedded in concreteand 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
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