### Question
Can you define what modification means?


### Answer
**Modification** is defined as the following in *45 U.S.C. § 821*:

> any Government action that alters the estimated cost of an outstanding direct loan (or direct loan obligation) or an outstanding loan guarantee (or loan guarantee commitment) from the current estimate of cash flows

#### Citation:
  - *45 U.S.C. § 821*
  - Heading: **CHAPTER 17-RAILROAD REVITALIZATION AND REGULATORY REFORM > SUBCHAPTER II-RAILROAD REHABILITATION AND IMPROVEMENT FINANCING**

