{"id":37,"date":"2022-04-08T12:57:05","date_gmt":"2022-04-08T17:57:05","guid":{"rendered":"https:\/\/modelrailroadresource.com\/WP\/?post_type=product&p=37"},"modified":"2025-12-11T14:48:23","modified_gmt":"2025-12-11T20:48:23","slug":"grs-signal-sa1-head-only","status":"publish","type":"product","link":"https:\/\/modelrailroadresource.com\/WP\/product\/grs-signal-sa1-head-only\/","title":{"rendered":"GRS Signal SA1 Head Only Kit: O Scale"},"content":{"rendered":"

From the catalogs of the General Railway Supply Company the SA1.<\/span><\/p>\n

The Type SA Signal produces a powerful signal indication at a minimum of energy consumption due to its scientific optical construction. It is equipped with an elliptical reflector which uses approximately 80 per cent of light emitted by the concentrated filament lamp. All three indications are projected through one lens, therefore the beam of light is always in the engineman\u2019s line of vision due to the unchanged location of the three indications. The following features have contributed largely to the rapid adoption of this signal since its introduction in February of 1927.<\/span><\/p>\n

It is now being used by:<\/span><\/p>\n

41 railroads in United States<\/span><\/p>\n

5 railroads in Canada<\/span><\/p>\n

6 railroads in Foreign Countries<\/span><\/p>\n

Signal head only for adding heads to our SA1 full signal.<\/strong><\/span><\/p>\n

LED is NOT included as there could be many variations. We used a red\/green Tony\u2019s TTX Ultra Micro Bicolor LED, 0605 Red & Green, 4 Pack, with resistors from Tony\u2019s Train Exchange.<\/strong><\/span><\/p>\n

Instructions here.<\/span><\/span><\/a><\/p>\n