MARTA has redundant electrical systems, so rail service continues at those stations.

The back-to-back fires underscored the reality that MARTA's 40-year-old rail system is still using its original electrical equipment. The agency plans to replace the systems powering its trains and stations beginning next year.

But the fires prompted MARTA to bring in electrical experts to assess its systems and prioritize repairs. Earlier this month agency officials said the assessment would cost about $2 million.

Now the full price tag is becoming evident.

Last week Parker approved an emergency procurement of $4.7 million for repairs at Peachtree Center. The work, which includes testing and replacing a variety of equipment, is expected to take four months.

Parker also approved $1.6 million in repairs at the Lakewood station. The work is expected to take eight months.

The costs include the initial $2 million for assessing the damage.

Fisher said two firms have received contracts for some assessment work – WSP USA ($316,000) and HNTB ($255,000). But most of the work will be done by MARTA. Fisher said the costs include equipment, additional staffing and overtime.