architects have also been asked to al- low for the future installation of a continuous balustrade separating the passengers from the track. The balus- trade will have automatically control- led gates, operating in unison with and
train corresponding to the spaced 35ft. on centres.
doors,
Correspondingly, at underground stations provision has to be made in the platform design for a full-height con- tinuous screen along the full length of the platform. Besides the immediately obvious functions of keeping people from falling or jumping under trains, or being pushed against moving trains, the screens at underground stations will also permit controlled ventilation of the platform and station by isolat- ing tunnel air from the station area; eliminate wind and dust raised by the 'piston' effect of entering and exiting trains; and reduce the amount of train noise reaching the platform. Incident- ally, a leaning rail attached to the screen will provide a more comfortable waiting place.
The balustrades and screens will be supplied as standard packaged items and their design is therefore not within the province of the stations' architects.
As regards comfort facilities, seat- ing is to be provided on the stations; but a dismaying little note in the standards states that toilets will be provided for use by one person at a time... locked when not in use and with entry controlled by the station agent'.
This leads us to maintenance prob- lems, of course, and from there to the suitability of materials. Attention paid to these aspects during design will be repaid handsomely during the life of a public building like a station.
The following abbreviated list of finish materials, quoted from the BART architectural standards, throws interesting light on American ex- perience and practice. The list provides plenty of food for speculation - e.g. the hesitation regarding unsurfaced concrete and painted finishes.
Floor materials
1. Acceptable
a. Monolithic materials: concrete toppings, cement terrazzo, and synthe- tic resin toppings (polyesters, epoxies, etc.-heavy grades).
b. Unit materials: granite, quarry tile, brick, unglazed ceramic tile, ce- ment tile, terrazzo tile, and synthetic resin tile.
Far East BUILDER, May 1971
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Three perspectives of above-ground stations: Pleasant Hill (Masten & Hurd and Joseph Esherick), Hayward (Wurster Bernardi & Emmons) and Fruitvale (Reynolds & Chamberlain), showing differing treatments of screen elements within the basic limitations of the pre-
fabricated standard structural units
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· Kiss-and-ride bays,
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