How to recover a crashed innodb table...?
I created a table called test2 

CREATE TABLE `test2` (   `t` int(11) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1;


I then inserted one record 

insert into test2 values(1);


I stopped MySQL and then added a bunch of characters to the test2.frm file with vi.

I then started MySQL and saw the following 

mysql&gt; show table status \G;
*************************** 1. row ***************************
           Name: test2
         Engine: NULL
        Version: NULL
     Row_format: NULL
           Rows: NULL
 Avg_row_length: NULL
    Data_length: NULL
Max_data_length: NULL
   Index_length: NULL
      Data_free: NULL
 Auto_increment: NULL
    Create_time: NULL
    Update_time: NULL
     Check_time: NULL
      Collation: NULL
       Checksum: NULL
 Create_options: NULL
        Comment: Incorrect information in file: './test2/test2.frm'


I then created another table with the same structure

CREATE TABLE `test3` (   `t` int(11) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1;


I then stopped mysql and copied test3.frm over test2.frm

cp /var/lib/mysql/testdb/test3.frm /var/lib/mysql/testdb/test2.frm


I restarted MySQL and had access to test2

mysql&gt; show table status \G;
*************************** 1. row ***************************
           Name: test2
         Engine: InnoDB
        Version: 10
     Row_format: Compact
           Rows: 1
 Avg_row_length: 16384
    Data_length: 16384
Max_data_length: 0
   Index_length: 0
      Data_free: 25675431936
 Auto_increment: NULL
    Create_time: 2012-02-07 16:24:20
    Update_time: NULL
     Check_time: NULL
      Collation: latin1_swedish_ci
       Checksum: NULL
 Create_options: 
        Comment: 


Here is the record that I inserted

mysql&gt; select * from test2;
+------+
| t    |
+------+
|    1 |
+------+
1 row in set (0.00 sec)


If you know the structure of the table City , you could create an identical table and then copy the .frm file over the existing corrupted one