### Question
How does the law define hardware?


### Answer
Under *49 U.S.C. § 20157*, **hardware** is defined as:

> a locomotive apparatus, a wayside interface unit (including any associated legacy signal system replacements), switch position monitors needed for a positive train control system, physical back office system equipment, a base station radio, a wayside radio, a locomotive radio, or a communication tower or pole

#### Citation:
  - *49 U.S.C. § 20157*
  - Heading: **SUBTITLE V-RAIL PROGRAMS > PART A-SAFETY > CHAPTER 201-GENERAL > SUBCHAPTER II-PARTICULAR ASPECTS OF SAFETY**

