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The Sprague-Thomson was conceived in 1908 by the synthesis of already-existing systems. Beginning in 1907, the CMP was constructing metallic stock. The motrices 500 (motor cars) formed the first series of Sprague-Thomson, which was referred to familiarly as simply “Sprague”. The cars were constructed entirely of metal and had two motors.
http://fr.wikipedia.org/wiki/Sprague-Thomson
engine referred to as a “grande loge” is M500 and associated cars are Bb170 for 2nd class and Ab167 for 1st class.
Period when this set appears is 1908 to 1930