Tag 'railway:signal:combined:substitute_signal = DE-ESO:db:zs12;DE-ESO:dr:zs1'

Value histogram for key 'source'

• 8: bing; estimate; survey
• 3: estimate; survey
• 2: estimation; survey
• 1: extrapolation; estimation; survey
• 1: survey
• 1: bing; survey
• 1: estimate; extrapolate; survey