After conducting research, I was unable to find any information regarding a boat ramp named Railroad Avenue Walker in Minnesota. It is possible that the name or location may be incorrect. However, based on general information regarding boat ramps in Minnesota, there are many different types of boat ramps available throughout the state, including those for motorized boats, non-motorized boats, and pontoons. The width of these ramps can vary depending on the location and intended use. The body of water that a boat ramp services can also vary, as Minnesota is home to numerous lakes, rivers, and other bodies of water. The types of craft permitted on the water will also vary based on the location and any specific regulations in place. It is important to consult local authorities and regulations before using any boat ramp or watercraft in Minnesota.