Related Clues:

• Alternative to air
• Fulminate (against)
• Third ___ (track adjunct)
• Pedestrian safety feature
• Billiards cushion
• Commuter line, perhaps
• Grand Canyon addition
• What a volcano can do
• Rebuke bitterly
• Part of a billiard table
• Commuter's option
• Train travel
• Eject violently
• Traveler's choice
• Emulate a geyser