Possible Clues:

• One ruminant's tracks crossed by another
• Antelope and bull crossing railway
• Atwood's "___ and Crake"
• Steer around tracks, seeking African creature
• Method of transport adopted by neat African native
• Antelope, bull or cow crossing railway
• Yorick's heading off to speak, the beast
• African antelope of the genus of the same name
• Large cow straddling the line, or antelope
• Big African antelope