Which item is a common application of lead-based paint?

Lead-based paint has historically been used in various industrial and commercial applications due to its durability and protective qualities, especially in environments subject to wear and tear, such as bridges and railway equipment. These applications take advantage of lead paint's ability to resist corrosion and weathering, making it ideal for outdoor structures that must endure harsh conditions.

On the other hand, while lead-based paint may occasionally be found in the context of furniture restoration, this use is less common and often discouraged due to health risks. Similarly, consumer electronics and household cleaning products do not typically involve lead-based paint, as these products tend to adhere to strict safety regulations that limit or prohibit lead content to ensure consumer safety. Thus, the use of lead-based paint in bridges and railway equipment stands out as the most fitting application among the provided options.